Block principal component analysis-based device for confirming face

The invention relates to a block principal component analysis-based device for confirming a face. The device comprises an information database of a person to be confirmed, a storage device and a confirming device, wherein the storage device stores intelligent card information of each card holder, N face sample pictures x1, x2,...,xi,...,xN of each card holder and a projection vector of each sample picture for calculating a projection vector Zvar of a face picture of the card holder; the confirming device is used for confirming the face; an Euclidean distance D (Zvar) between the projection vector of the sample picture xi, and the projection vector Zvar of the face picture xvar is calculated; and the card holder is considered as a real master of an intelligent card if D (Zvar) is less than a set threshold. The device preprocesses an image by using a Census transformation method to reduce influence of illumination change on face confirmation. The device adopts a block principal component analysis-based arithmet